Package pygeodesy :: Module vector2d |
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# Module vector2d

2- or 3-D vectorial functions circin6, circum3, circum4_, iscolinearWith, meeus2, nearestOn, radii11 and soddy4.

Version: 22.10.12

Classes
| Circin6Tuple 6-Tuple `(radius, center, deltas, cA, cB, cC)` with the `radius`, the trilaterated `center` and contact points of the inscribed aka In- circle of a triangle.
| Circum3Tuple 3-Tuple `(radius, center, deltas)` with the `circumradius` and trilaterated `circumcenter` of the `circumcircle` through 3 points (aka {Meeus}' Type II circle) or the `radius` and `center` of the smallest Meeus' Type I circle.
| Circum4Tuple 4-Tuple `(radius, center, rank, residuals)` with `radius` and `center` of a sphere least-squares fitted through given points and the `rank` and `residuals` -if any- from numpy.linalg.lstsq.
| Meeus2Tuple 2-Tuple `(radius, Type)` with `radius` and Meeus' `Type` of the smallest circle containing 3 points.
| Radii11Tuple 11-Tuple `(rA, rB, rC, cR, rIn, riS, roS, a, b, c, s)` with the `Tangent` circle radii `rA`, `rB` and `rC`, the `circumradius` `cR`, the `Incircle` radius `rIn` aka `inradius`, the inner and outer Soddy circle radii `riS` and `roS`, the sides `a`, `b` and `c` and semi-perimeter `s` of a triangle, all in `meter` conventionally.
| Soddy4Tuple 4-Tuple `(radius, center, deltas, outer)` with `radius` and (trilaterated) `center` of the inner Soddy circle and the radius of the `outer` Soddy circle.

Functions
circin6(point1, point2, point3, eps=8.881784197001252e-16, useZ=True) Return the radius and center of the inscribed aka Incircle of a (2- or 3-D) triangle. |
circum3(point1, point2, point3, circum=True, eps=8.881784197001252e-16, useZ=True) Return the radius and center of the smallest circle through or containing three (2- or 3-D) points. |
circum4_(*points, **useZ_Vector_and_kwds) Best-fit a sphere through three or more (3-D) points. |
meeus2(point1, point2, point3, circum=False, useZ=True) Return the radius and Meeus' Type of the smallest circle through or containing three (2- or 3-D) points. |
radii11(point1, point2, point3, useZ=True) Return the radii of the `In-`, Soddy and `Tangent` circles of a (2- or 3-D) triangle. |
soddy4(point1, point2, point3, eps=8.881784197001252e-16, useZ=True) Return the radius and center of the `inner` Soddy circle of a (2- or 3-D) triangle. |

Variables
| __all__ = `_ALL_LAZY.vector2d`

Function Details

### circin6 (point1, point2, point3, eps=8.881784197001252e-16, useZ=True) |
Return the radius and center of the inscribed aka Incircle of a (2- or 3-D) triangle. Arguments: `point1` - First point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point2` - Second point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point3` - Third point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `eps` - Tolerance for function pygeodesy.trilaterate3d2 if `useZ is True` else pygeodesy.trilaterate2d2. `useZ` - If `True`, use the Z components, otherwise force `z=INT0` (`bool`). Returns: Circin6Tuple`(radius, center, deltas, cA, cB, cC)`. The `center` and contact points `cA`, `cB` and `cC`, each an instance of `point1`'s (sub-)class, are co-planar with the three given points. Raises: `ImportError` - Package `numpy` not found, not installed or older than version 1.10 and `useZ is True`. `IntersectionError` - Near-coincident or -colinear points or a trilateration or `numpy` issue. `TypeError` - Invalid `point1`, `point2` or `point3`. See Also: Functions radii11 and circum3, Contact Triangle and Incircle.

### circum3 (point1, point2, point3, circum=True, eps=8.881784197001252e-16, useZ=True) |
Return the radius and center of the smallest circle through or containing three (2- or 3-D) points. Arguments: `point1` - First point (`Cartesian`, Vector3d, `Vector3Tuple` or `Vector4Tuple`). `point2` - Second point (`Cartesian`, Vector3d, `Vector3Tuple` or `Vector4Tuple`). `point3` - Third point (`Cartesian`, Vector3d, `Vector3Tuple` or `Vector4Tuple`). `circum` - If `True` return the `circumradius` and `circumcenter` always, ignoring the Meeus' Type I case (`bool`). `eps` - Tolerance for function pygeodesy.trilaterate3d2 if `useZ is True` else pygeodesy.trilaterate2d2. `useZ` - If `True`, use the Z components, otherwise force `z=INT0` (`bool`). Returns: A Circum3Tuple`(radius, center, deltas)`. The `center`, an instance of `point1`'s (sub-)class, is co-planar with the three given points. Raises: `ImportError` - Package `numpy` not found, not installed or older than version 1.10 and `useZ is True`. `IntersectionError` - Near-coincident or -colinear points or a trilateration or `numpy` issue. `TypeError` - Invalid `point1`, `point2` or `point3`. See Also: Functions pygeodesy.circum4_ and pygeodesy.meeus2 and Meeus, J. Astronomical Algorithms, 2nd Ed. 1998, page 127ff, circumradius and circumcircle.

### circum4_ (*points, **useZ_Vector_and_kwds) |
Best-fit a sphere through three or more (3-D) points. Arguments: `points` - The points (each a `Cartesian`, Vector3d, `Vector3Tuple`, or `Vector4Tuple`). `useZ_Vector_and_kwds` - Keyword arguments `useZ=True` (`bool`) to use the Z components, otherwise force all `z=INT0`, class `Vector=None` to return the center point with optionally, additional n`Vector` keyword arguments, otherwise the first `points`' (sub-)class is used. Returns: Circum4Tuple`(radius, center, rank, residuals)` with `center` an instance of `points[0]`' (sub-)class or `Vector` if specified. Raises: `ImportError` - Package `numpy` not found, not installed or older than version 1.10. `NumPyError` - Some `numpy` issue. `PointsError` - Too few `points`. `TypeError` - One of the `points` is invalid. See Also: Functions pygeodesy.circum3 and pygeodesy.meeus2, Jekel, Charles F. Least Squares Sphere Fit Sep 13, 2015, Appendix A, numpy.linalg.lstsq and Eberly 6.

### meeus2 (point1, point2, point3, circum=False, useZ=True) |
Return the radius and Meeus' Type of the smallest circle through or containing three (2- or 3-D) points. Arguments: `point1` - First point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point2` - Second point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point3` - Third point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `circum` - If `True` return the `circumradius` and `circumcenter` always, overriding Meeus' Type II case (`bool`). `useZ` - If `True`, use the Z components, otherwise force `z=INT0` (`bool`). Returns: Meeus2Tuple`(radius, Type)`, with `Type` the `circumcenter` iff `circum=True`. Raises: `IntersectionError` - Near-coincident or -colinear points, iff `circum=True`. `TypeError` - Invalid `point1`, `point2` or `point3`. See Also: Functions pygeodesy.circum3 and pygeodesy.circum4_ and Meeus, J. Astronomical Algorithms, 2nd Ed. 1998, page 127ff, circumradius and circumcircle.

### radii11 (point1, point2, point3, useZ=True) |
Return the radii of the `In-`, Soddy and `Tangent` circles of a (2- or 3-D) triangle. Arguments: `point1` - First point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point2` - Second point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point3` - Third point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `useZ` - If `True`, use the Z components, otherwise force `z=INT0` (`bool`). Returns: Radii11Tuple`(rA, rB, rC, cR, rIn, riS, roS, a, b, c, s)`. Raises: `TriangleError` - Near-coincident or -colinear points. `TypeError` - Invalid `point1`, `point2` or `point3`. See Also: Circumradius, Incircle, Soddy Circles and Tangent Circles.

### soddy4 (point1, point2, point3, eps=8.881784197001252e-16, useZ=True) |
Return the radius and center of the `inner` Soddy circle of a (2- or 3-D) triangle. Arguments: `point1` - First point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point2` - Second point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `point3` - Third point (`Cartesian`, Vector3d, `Vector3Tuple`, `Vector4Tuple` or `Vector2Tuple` if `useZ=False`). `eps` - Tolerance for function pygeodesy.trilaterate3d2 if `useZ is True` otherwise pygeodesy.trilaterate2d2. `useZ` - If `True`, use the Z components, otherwise force `z=INT0` (`bool`). Returns: Soddy4Tuple`(radius, center, deltas, outer)`. The `center`, an instance of `point1`'s (sub-)class, is co-planar with the three given points. The `outer` Soddy radius may be `INF`. Raises: `ImportError` - Package `numpy` not found, not installed or older than version 1.10 and `useZ is True`. `IntersectionError` - Near-coincident or -colinear points or a trilateration or `numpy` issue. `TypeError` - Invalid `point1`, `point2` or `point3`. See Also: Functions radii11 and circum3 and Soddy Circles.